6 Pack Distributor Date Break

Where is the date break for the early #2875982 6 Pack auto distributor vs the later #3438349 version. I'm dealing with a build date of Nov. 21 of 69 on the car in question. Should the tag read IBS 4014 or IBS 4017?

Yours would be 2875982 IBS 4017A but IBS 4014D would also be OK

The cut off was the first of the year